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A R R — 2 2 —9 3 T H U 9 : 17 C O N D O R E ART H i t u . u M I � 1 1 r . — <br /> . FROA UHOCgL CERT-HCFTH • d3.03. 0111 $5 P. 5 <br /> to collect groundwater samples from each of the wells during Condor s <br /> initial groundwater sampling. <br /> The attached figure shows the well locations proposed by Condor and <br /> the new locations proposed by @ 6 E, E b E has labeled the well <br /> locations for purposes of discussion. Contamination was discovered <br /> beneath the tank farm around the former Oil-eater separator and connected <br /> dry wells. Monitoring Well 1 (10171) has been moved elosoc to the tank <br /> farm in the area of the underground pipeline connecting the shop to the <br /> former oil-vater separator In order to collect samples near known <br /> contamination. Monitoring Well 2 (Hw2) has been moved to the approximate <br /> center of the former wastewater collection pond; the location proposed by <br /> Condor appears to be just outside the area of the former pond. <br /> Monitoring Well 3 (MM3) has been moved to the southwestern corner of the <br /> facility; sampling done in this area by PureGro before the site was <br /> combined with Brea indicated possible contamination, Moving MW3 here <br /> will expand the area covered by the three wells, incorporating more of <br /> the facility into the soil and groundwater Investigation without <br /> affecting Condor's ability to determine local groundwater gradients. An <br /> alternative would be to install four veils instead of three, <br /> E 6 E also proposes replacing the second 6-inch liner with two 3-inch <br /> liners. These liners would be given to EPA for analysis. Although <br /> debris (sluff) falling into the the first or uppermost liner make it <br /> unacceptable for analysis, it may be sufficient for logging purposes. An <br /> alternative approach would be to use a longer split-spoon sampler fitted <br /> with four or more brass liners; the first liner could be discarded and <br /> the remaining liners could be used for logging or analysis. <br /> Modifying the Work Plan as described, will allow EPA to conduct the <br /> sampling end analysis required to meet Its objectives and still meet the <br /> soil and groundwater investigation goals of the existing work Plan. <br /> petbrea2/memo <br />